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Method for transmitting reference signals in a downlink multiple input multiple output system

a communication system and reference signal technology, applied in multiplex communication, orthogonal multiplex, wireless commuication services, etc., can solve the problems of general degrading the performance of a ue at the cell edge, difficult to implement scheme 1 in a real system, and long delay

Active Publication Date: 2011-09-29
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0075]A plurality of cells participating in a CoMP operation can transmit RSs to a UE, minimizing ICI in the exemplary embodiments of the present invention.

Problems solved by technology

It is known that Inter-Cell Interference (ICI) generally degrades the performance of a UE at a cell edge.
However, UEs of the CoMP cells should feed back too a large amount of information, which makes it difficult to implement Scheme 1 in a real system.
Moreover, the sharing of channel information among the neighbor cells may lead to a long delay.
While this scheme is considered as offering a gain with a minimal backhaul overhead, the feedback overhead of the UEs may impose a constraint on the system.
Consequently, system performance is degraded.

Method used

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  • Method for transmitting reference signals in a downlink multiple input multiple output system
  • Method for transmitting reference signals in a downlink multiple input multiple output system
  • Method for transmitting reference signals in a downlink multiple input multiple output system

Examples

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Embodiment Construction

[0209]Various embodiments have been described in the best mode for carrying out the invention.

INDUSTRIAL APPLICABILITY

[0210]The present invention is applicable to a UE, an eNB, or other devices in a wireless communication system.

[0211]Exemplary embodiments described above are combinations of elements and features of the present invention. The elements or features may be considered selective unless otherwise mentioned. Each element or feature may be practiced without being combined with other elements or features. Further, an embodiment of the present invention may be constructed by combining parts of the elements and / or features. Operation orders described in embodiments of the present invention may be rearranged. Some constructions of any one embodiment may be included in another embodiment and may be replaced with corresponding constructions of another embodiment. It is obvious to those skilled in the art that claims that are not explicitly cited in each other in the appended clai...

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Abstract

In a system having a plurality of cells participating in a Coordinated Multi-Point (CoMP) operation, a method for transmitting Reference Signals (RSs) to User Equipment (UE) includes generating, by Base Station (BS) included in each of the plurality of cells, a subframe including RSs for a UE located in the each of the plurality of cells, and transmitting the generated subframe to the UE by the BS. The RSs include RSs for channel measurement, and RSs for data demodulation, the plurality of cells are grouped according to frequency shift values applied to the RSs for channel measurement and RS allocation patterns are determined for two cells among the plurality of cells according to a predetermined rule.

Description

TECHNICAL FIELD[0001]The present invention relates to a method for efficiently transmitting Reference Signals (RSs) in a Multiple Input Multiple Output (MIMO) communication system, under an environment where antennas are added to an existing system.BACKGROUND ART[0002]Long Term Evolution (LTE) Physical Structure[0003]3rd Generation Partnership Project (3GPP) supports a type-1 radio frame structure for application in Frequency Division Duplex (FDD) and a type-2 radio frame structure for application in Time Division Duplex (TDD).[0004]FIG. 1 illustrates the type-1 radio frame structure. A type-1 radio frame includes 10 subframes each having two slots.[0005]FIG. 2 illustrates the type-2 radio frame structure. A type-2 radio frame includes two half frames each having 5 subframes, a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP), and an Uplink Pilot Time Slot (UpPTS). Each subframe includes two slots. The DwPTS is used for initial cell search, synchronization, or channel estimatio...

Claims

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Application Information

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IPC IPC(8): H04W72/00
CPCH04B7/0413H04L5/0035H04L5/0048H04L5/005H04L5/0053H04W72/0453H04L25/0226H04J11/0053H04L5/0032H04W24/02H04W72/0446H04L5/0094H04L5/0007H04L27/261H04B7/0626H04L25/0218
Inventor NOH, YU JINROH, DONG WOOKAHN, JOON KUIKANG, BYEONG WOOLEE, DAE WONKIM, BONG HOESEO, DONG YOUN
Owner LG ELECTRONICS INC
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